SK286555B6 - Set of turning up trolleys of a shaping drum for producing, in particular tyres - Google Patents

Abstract

Set of turning up trolleys consists of two consolidation rings (2) are symmetrically arranged opposite each other on either side of a central extension (4) of a lever arm (1). Attachment of the rings (2) to the central arm is by a rotating coupling (5), whereby they are made of solid material and at the top of turning up surfaces are equipped with rubber layer (21).

Description

Technical field

BACKGROUND OF THE INVENTION The invention relates to the construction of a plurality of folding rollers of a ready-to-wear drum of a side wrapping system for the production of tires, particularly for trucks and cars.

BACKGROUND OF THE INVENTION

One of the types of equipment for the production of automobile tires, especially for freight vehicles, is ready-made drums with a so-called lever wrapping system. It is known in these devices to design a plurality of folding pulleys in which a recess is formed in each end of the lever arm member, in which a pressure roller, generally made of nylon, is located. This wheel protrudes less than halfway ahead of the lever arm and is pivotally mounted on the sides of the recess.

By its rolling, a plurality of these rollers ensure that the side layers of the raw rubber components are rolled and pressed against the sidewall of the housing.

The main disadvantage of said construction is that it is not capable of ensuring that the pressure wheels are spaced to an extent that is uniform throughout the assembly, with sufficient size of the folding surfaces and the smallest gaps between them. As a result, the tires produced have visible surface irregularities on their sides, which raises some quality concerns for the customer, and these irregularities may also cause earlier tire wear.

From WO 98/18613, DE 1884768U and DE 4416514 A1, there are known solutions of a pressure roller made as a plurality of side-by-side multiple rollers, which are centrally mounted on the building drum of a tire casing manufacturing machine.

The disadvantage of these solutions is that they cannot be used in equipment with a limited folding width of a certain level.

A known solution from DE 1916768 B (equivalent to US 3887423 A1) is to design a pulley as a pair of thrust wheels with laterally protruding rotary joint fastenings, which in turn limits the position of the pairs side by side to a sufficiently close distance.

SUMMARY OF THE INVENTION

These drawbacks are largely eliminated by a plurality of folding rollers of a ready-to-wear drum for manufacturing, in particular, automobile tires according to the invention, which consists of pairs of pressure wheels, symmetrically positioned opposite the center arms, which protrude at the end of the lever arm links. The pairs of pressure wheels are attached to the center arms by pivot joints.

The pivot joint itself is preferably formed by a bolt, a nut and separating pads for fixing bearings located in the center of the pressure wheels. The bolt heads and nuts are embedded under the outer edge of the pressure wheels in order to ensure that the pressure wheel of the secondary link can be positioned close to it.

The pressure wheels are preferably made of a rigid material and are provided with a rubber layer on the surface of the folding surfaces which, by their elasticity under pressure, further widens the pressure surface and adheres smoothly to the molding material of the sidewall.

In particular, the design makes it possible to reduce the gap between the two pressure wheels of adjacent links of the lever arm and also to increase their outer diameter and to increase the size of the total folding surface per sidewall.

Overview of the figures in the drawing

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated in greater detail in the accompanying drawing. 1 is a view of a portion of the assembly, two adjacent folding rollers disposed on two adjacent links of the lever arm.

DETAILED DESCRIPTION OF THE INVENTION

At the end of each lever arm member 1 (see FIG. 1) of the building drum, central arms 4 are formed. On both sides of the center arm 4, a pressure wheel 2 made of light metal is fixed by a rotary joint 5. The surface of the press surfaces of the pressure wheels 2 is provided with a rubber layer

SK 286555 Β6 ou 6 with a thickness of 6 mm. The rotary joint 5 is formed by a bolt 51, a nut 52, a washer 53 and bearings 3.

All the components of the future jacket are placed on the ready-made drum and the gathering process is performed. This is followed by the approach of the rollers to the sidewall of the housing (not indicated in the figure) by means of the links 1 of the lever arm. All thrust rollers 2 of the bundle of rollers run simultaneously on the sidewall of the casing and evenly press and push the layers of raw rubber components onto the sidewall. The lever arm detaches the rollers from the sidewall of the housing and performs other technological manufacturing operations.

Claims (2)

PATENT CLAIMS A set of folding rollers of a ready-made drum for manufacturing, in particular, automobile tires, comprising pairs of pressure wheels which are symmetrically positioned opposite the center arms, which protrude at the ends of the links of the lever arm, in that the pressure wheels (2) are made of rigid material and are provided with a rubber layer (21) on the surface of the folding surfaces. The assembly drum of the ready-made drum according to claim 1, characterized in that the rotary joint (5) is formed by a bolt (51), a nut (52) and separating washers (53) for fixing the bearings (3) located in the center of the pressure wheels. (2), wherein the screw head (51) and nut head (52) are recessed below the outer edge of the pressure wheels (2).